Lens module and projection device

Abstract

A lens module includes a first base, a lens assembly assembled on the first base, a second base stacked on the first base, a first adjustment member, and a second adjustment member. The first base has at least one first rib structure extending along a second axis, and at least one second rib structure extending along a first axis. The first adjustment member is movably engaged with the first rib structure along the first axis. The second adjustment member is movably engaged with the second rib structure along the second axis. When the first base moves along the first axis, the second adjustment member avoids the second rib structure. When the first base moves along the second axis, the first adjustment member avoids the first rib structure. A projection device is also provided.

What is claimed is: 
     
       1. A lens module adapted for a projection device, the lens module comprising:
 a first base having at least one first rib structure and at least one second rib structurez wherein the at least one first rib structure extends along a direction parallel to a second axis, the at least one second rib structure extends along a direction parallel to a first axis, and the first axis is perpendicular to the second axis, wherein the first base has at least one first expanded hole; 
 a lens assembly assembled on the first base; 
 a second base stacked on the first base, wherein the second base has at least one second expanded hole; 
 a first adjustment member disposed on the second base and movably engaged with the at least one first rib structure to drive the first base to move along the first axis; 
 a second adjustment member disposed on the second base and movably engaged with the at least one second rib structure to drive the first base to move along the second axis; and 
 at least one locking member disposed through the at least one first expanded hole and the at least one second expanded hole corresponding to each other, wherein the first base bears movably against the second base, and an expansion axial direction of the at least one first expanded hole is perpendicular to an expansion axial direction of the at least one second expanded hole, 
 wherein when the first base moves along the first axis, the second adjustment member avoids the at least one second rib structure, and when the first base moves along the second axis, the first adjustment member avoids the at least one first rib structure. 
 
     
     
       2. The lens module according to  claim 1 , wherein the first adjustment member comprises a threaded element and a first knob taking the first axis as a rotation axis. 
     
     
       3. The lens module according to  claim 1 , wherein the second adjustment member comprises a threaded element and a second knob taking the second axis as a rotation axis. 
     
     
       4. The lens module according to  claim 1 , wherein the at least one first rib structure comprises a plurality of first rib structures parallel to the second axis, and the plurality of first rib structures form a plurality of first rib grooves, wherein the plurality of first rib structures are arranged along the first axis. 
     
     
       5. The lens module according to  claim 1 , wherein the at least one second rib structure comprises a plurality of second rib structures parallel to the first axis, and the plurality of second rib structures form a plurality of second rib grooves, wherein the plurality of second rib structures are arranged along the second axis. 
     
     
       6. The lens module according to  claim 1 , wherein when the first base moves along the first axis or along the second axis, the locking member interferes with one of the first expanded hole and the second expanded hole, and moves along the other of the first expanded hole and the second expanded hole. 
     
     
       7. The lens module according to  claim 6 , wherein the expansion axial direction of the first expanded hole is parallel to the first axis or the second axis, and the expansion axial direction of the second expanded hole is parallel to the second axis or the first axis. 
     
     
       8. A projection device, comprising:
 a light source configured to provide an illumination light beam; 
 an optical engine module configured to convert the illumination light beam into an image light beam; and 
 a lens module configured to receive the image light beam, and comprising: 
 a first base having at least one first rib structure and at least one second rib structure, wherein the at least one first rib structure extends along a direction parallel to a second axis, the at least one second rib structure extends along a direction parallel to a first axis, and the first axis is perpendicular to the second axis, wherein the first base has at least one first expanded hole; 
 a lens assembly assembled on the first base; 
 a second base stacked on the first base, wherein the second base has at least one second expanded hole; 
 a first adjustment member disposed on the second base and movably engaged with the at least one first rib structure todrive the first base to move along the first axis; 
 a second adjustment member disposed on the second base and movably engaged with the at least one second rib structure to drive the first base to move along the second axis; and 
 at least one locking member disposed through the at least one first expanded hole and the at least one second expanded hole corresponding to each other, wherein the first base bears movably against the second base, and an expansion axial direction of the at least one first expanded hole is perpendicular to an expansion axial direction of the at least one second expanded hole, 
 wherein when the first base moves along the first axis, the second adjustment member avoids the at least one second rib structure, and when the first base moves along the second axis, the first adjustment member avoids the at least one first rib structure. 
 
     
     
       9. A lens module adapted for a projection device, the lens module comprising:
 a first base having at least one first rib structure and at least one second rib structure, wherein the at least one first rib structure extends along a direction parallel to a second axis, the at least one second rib structure extends along a direction parallel to a first axis, and the first axis is perpendicular to the second axis; 
 a lens assembly assembled on the first base; 
 a second base stacked on the first base; 
 a first adjustment member disposed on the second base and movably engaged with the at least one first rib structure to drive the first base to move along the first axis, wherein the first adjustment member comprises a gear element and a first knob taking the second axis as a rotation axis, and the first knob is disposed along the second axis, or the rotation axis of the first knob is parallel to the second axis; and 
 a second adjustment member disposed on the second base and movably engaged with the at least one second rib structure to drive the first base to move along the second axis, 
 wherein when the first base moves along the first axis, the second adjustment member avoids the at least one second rib structure, and when the first base moves along the second axis, the first adjustment member avoids the at least one first rib structure. 
 
     
     
       10. A lens module adapted for a projection device, the lens module comprising:
 a first base having at least one first rib structure and at least one second rib structure, wherein the at least one first rib structure extends along a direction parallel to a second axis, the at least one second rib structure extends along a direction parallel to a first axis, and the first axis is perpendicular to the second axis; 
 a lens assembly assembled on the first base; 
 a second base stacked on the first base; 
 a first adjustment member disposed on the second base and movably engaged with the at least one first rib structure to drive the first base to move along the first axis; and 
 a second adjustment member disposed on the second base and movably engaged with the at least one second rib structure to drive the first base to move along the second axis, wherein the second adjustment member comprises a gear element and a second knob taking the first axis as a rotation axis, and the second knob is disposed along the first axis, or the rotation axis of the second knob is parallel to the first axis, 
 wherein when the first base moves along the first axis, the second adjustment member avoids the at least one second rib structure, and when the first base moves along the second axis, the first adjustment member avoids the at least one first rib structure.